EP3449109A1 - Techniques de commande de turbocompresseur de véhicule basées sur la physique - Google Patents

Techniques de commande de turbocompresseur de véhicule basées sur la physique

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Publication number
EP3449109A1
EP3449109A1 EP17711942.7A EP17711942A EP3449109A1 EP 3449109 A1 EP3449109 A1 EP 3449109A1 EP 17711942 A EP17711942 A EP 17711942A EP 3449109 A1 EP3449109 A1 EP 3449109A1
Authority
EP
European Patent Office
Prior art keywords
target
controller
turbine
wastegate valve
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17711942.7A
Other languages
German (de)
English (en)
Other versions
EP3449109B1 (fr
Inventor
Yang Li
Songping Yu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FCA US LLC
Original Assignee
FCA US LLC
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Filing date
Publication date
Application filed by FCA US LLC filed Critical FCA US LLC
Publication of EP3449109A1 publication Critical patent/EP3449109A1/fr
Application granted granted Critical
Publication of EP3449109B1 publication Critical patent/EP3449109B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F02B37/186—Arrangements of actuators or linkage for bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/101—Three-way catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F02B37/025—Multiple scrolls or multiple gas passages guiding the gas to the pump drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10373—Sensors for intake systems
    • F02M35/1038—Sensors for intake systems for temperature or pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0228—Manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F02D2200/0408—Estimation of intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
    • F02D41/145—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure with determination means using an estimation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present application generally relates to turbocharged vehicles and, more particularly, to physics-based turbocharger control techniques.
  • a turbocharger is a turbine-driven forced-induction device that increases airflow in an internal combustion engine.
  • a compressor which is driven by turbine, draws in ambient air and compresses it before it enters the engine at an increased pressure. This results in a greater mass of air entering cylinders of the engine on each intake stroke, which increases the engine's efficiency through decreased throttling losses and increases the engine's power output.
  • Kinetic energy of exhaust gas produced by combustion of the air and fuel within the cylinders is then utilized to drive the turbine of the turbocharger.
  • a control system for a turbocharger of an engine includes a wastegate valve configured to divert exhaust gas from a turbine of the turbocharger, the turbine being rotatably coupled to a compressor of the turbocharger, and a controller configured to: obtain a torque request for the engine; determine a target compressor power based on the engine torque request; determine a normalized target turbine power based on the target compressor power; determine a target position for the wastegate valve based on the normalized target turbine power and a normalized exhaust flow; and actuate the wastegate valve to the target position.
  • the actuation of the wastegate valve by the controller (i) decreases at least one of boost reservation and throttling losses to (ii) increase at least one of engine response, performance, and fuel economy.
  • a method for controlling a turbocharger of an engine includes obtaining, by a controller, a torque request for the engine; determining, by the controller, a target compressor power based on the engine torque request; determining, by the controller, a normalized target turbine power based on the target compressor power; determining, by the controller, a target position for the wastegate valve based on the normalized target turbine power and a normalized exhaust flow; and actuating, by the controller, a wastegate valve to the target position, the wastegate valve being configured to divert exhaust gas from the turbine.
  • the actuating of the wastegate valve by the controller (i) decreases at least one of boost reservation and throttling losses to (ii) increase at least one of engine response, performance, and fuel economy.
  • the controller is further configured to: based on the engine torque request, determine a target engine airflow and a target pressure at an inlet of a throttle downstream from the compressor; and determine the target compressor power based on specific heat coefficients, air temperature and pressure at an inlet of the compressor, and an efficiency of the compressor.
  • the controller is configured to determine the normalized target turbine power based further on a specific heat coefficient, exhaust pressure at an outlet of the turbine, and exhaust temperature at an inlet of the turbine.
  • a barometric pressure sensor is configured to measure a barometric pressure
  • the controller is further configured to: determine the air pressure at the compressor inlet as a difference between the barometric pressure and a pressure drop across an air filter upstream from the compressor; and determine the exhaust pressure at the outlet of the turbine as a sum of the barometric pressure and a pressure drop across an exhaust treatment system downstream from the wastegate valve.
  • the turbine is a twin scroll turbine disposed upstream from the exhaust treatment system, and wherein the exhaust treatment system comprises a three-way catalytic converter and a muffler.
  • the controller is further configured to: determine a closed-loop correction value for the target position for the wastegate valve based on an error between the target throttle inlet pressure and an actual throttle inlet pressure; and actuate the wastegate valve to a corrected target position that is based on the target position and the closed- loop correction value.
  • a compressor inlet temperature sensor is configured to measure the air temperature at the compressor inlet
  • a throttle inlet pressure sensor is configured to measure the actual throttle inlet pressure
  • the controller is further configured to determine the turbine inlet exhaust temperature based on engine speed and engine load.
  • a wastegate valve actuator comprises an electric direct current to direct current (DC-DC) motor configured to actuate the wastegate valve, a wastegate valve position sensor configured to measure a position of the wastegate valve actuator, and the controller is further configured to determine a position of the wastegate valve based on the position of the DC-DC electric motor.
  • DC-DC direct current to direct current
  • Figure 1 is a functional block diagram of an example vehicle according to the principles of the present disclosure
  • FIG. 2 is a schematic diagram of an example turbocharger system according to the principles of the present disclosure
  • Figures 3A-3B are graphs illustrating example turbocharger data according to the principles of the present disclosure.
  • Figure 4 is a flow diagram of an example method of controlling a turbocharger of an engine according to the principles of the present disclosure.
  • the vehicle 100 includes an internal combustion engine 104 that combusts an air/fuel mixture to generate drive torque.
  • the engine 104 include spark ignition (SI) engines and compression ignition (CI) engines. While not illustrated or discussed herein, it will be appreciate that the vehicle 100 could include other torque-generating sources, such as an electric motor powered by a battery system in a hybrid configuration of the vehicle 100. Air is drawn into the engine 104 via an induction system 108 and exhaust gas resulting from combustion is expelled from the engine 104 via an exhaust system 1 12. The drive torque generated by the engine 104 is transferred from a crankshaft (not shown) of the engine 104 to a drivetrain 1 16 (e.g., wheels) of the vehicle 100 via a transmission (not shown).
  • a crankshaft not shown
  • a drivetrain 1 16 e.g., wheels
  • a turbocharger system 120 includes a turbocharger 124 that uses kinetic energy from the exhaust gas (e.g., exhaust gas back pressure or flow) in the exhaust system 1 12 to pressurize and thereby increase airflow into the engine 104 via the induction system 108. More particularly, the exhaust gas drives a turbine 128 (e.g., a twin scroll turbine) of the turbocharger 124, which in turn drives a compressor 132 (e.g., a centrifugal compressor) of the turbocharger 124 via a shaft 136.
  • a controller 140 controls airflow into the engine 104 to achieve a desired amount of air, e.g., based on torque request provided by a driver.
  • the vehicle 100 includes an exhaust gas recirculation (EGR) system (not shown) that recirculates exhaust gas into the engine 104 in a coordinated manner.
  • EGR exhaust gas recirculation
  • FIG. 2 a schematic diagram of an example configuration 200 of the turbocharger system 120 is illustrated.
  • Air is drawn into the induction system 108 by the compressor 132 through an air cleaner or air filter (AF) 204.
  • An inlet temperature sensor 208 is configured to measure a temperature of the air at an inlet of the compressor 132.
  • Pressurized air output by the compressor 132 is selectively recirculated via a compressor recirculation path 212 that is regulated by a compressor recirculation valve 216.
  • the pressurized air is also selectively provided to an intake manifold 228 of the engine 104 via a throttle valve 220 (e.g., a butterfly valve).
  • a throttle valve 220 e.g., a butterfly valve
  • An inlet pressure sensor 224 is configured to measure an air pressure at an inlet of the throttle valve 220.
  • An optional air cooler 232 is configured to cool the pressurized air provided to the intake manifold 228.
  • the pressurized air in the intake manifold 228 is distributed to a plurality of cylinders 236 and combined with fuel to create a pressurized air/fuel mixture. While only four cylinders are shown, it will be appreciated that the engine 104 could include any suitable number of cylinders.
  • the fuel is injected into the engine 104 via fuel injectors (not shown) arranged in any suitable configuration (port fuel injection, direct fuel injection, etc.).
  • the combustion of the pressurized air/fuel mixture within the cylinders 236 drives pistons (not shown), which rotatably turn the crankshaft (not shown) to generate drive torque.
  • Pressurized exhaust gas resulting from combustion is expelled from the cylinders 236 into an exhaust manifold 240.
  • kinetic energy of the pressurized exhaust gas is utilized by the turbocharger system 120. More particularly, the pressure/flow of the pressurized exhaust gas causes the turbine 128 to rotate, which in turn drives the compressor 132 via the shaft 136.
  • the pressurized exhaust gas selectively bypasses the turbine 128 via a turbine bypass path 244 that is regulated by a wastegate valve 248.
  • the wastegate valve 248 is actuated by a wastegate actuator 252.
  • the wastegate actuator 252 comprises a direct current to direct current (DC-DC) electric motor that is driven (e.g., via an electric current) to position the wastegate valve 248 at a desired position and a position sensor 256 configured to measure a position of the wastegate valve 248.
  • DC-DC direct current to direct current
  • the wastegate valve 248 is configured to control an amount of the pressurized exhaust gas that is driving the turbine 128, which is also known as a level of "boost.” Exhaust gas output by or bypassing the turbine 128 is then treated by an exhaust treatment system (ETS) 260 before being released into the atmosphere.
  • the ETS 260 includes a three-way catalytic converter (TWC) and a muffler, but it will be appreciated that other suitable configurations could be implemented for the ETS 260.
  • the discloses techniques directly link a target power for the compressor 132 to a target position for the wastegate valve 248.
  • a target turbine pressure ratio i.e., inlet vs. outlet pressures
  • target turbine and wastegate mass flow rates i.e., inlet vs. outlet pressures
  • Cp Air and y Air are a specific heat at constant pressure of intake air and a specific heat ratio of intake air, respectively;
  • T CompIn is compressor inlet temperature, measured by the inlet temperature sensor 208;
  • P CO mpin is compressor inlet pressure, which is calculated as a barometric pressure (P Baro , measured by a barometric pressure sensor 264 within or associated with the controller 140) minus a pressure loss across the air filter 204 (predetermined or modeled/estimated);
  • ⁇ ⁇ is a compressor isentropic efficiency map based on compressor corrected mass flow rate and pressure ratio;
  • P CO mpRef an d TcompRef are reference compressor inlet pressure and temperature, respectively.
  • the target turbine pressure ratio (Pr ⁇ ) has a relationship ( i) with the target turbine power llows: where Cp Exh is a specific heat at constant pressure of the exhaust gas; P Tb0u t is turbine outlet pressure, which is calculated based on barometric pressure p Baro Pl us a pressure loss across the ETS 260 (predetermined or modeled/estimated); and T TbIn is turbine inlet temperature (i.e. , exhaust temperature), which is determined through an engine load/engine speed calibration mapping process.
  • the term P T bout c PExh ⁇ T T bin is considered a turbine boundary condition to normalize turbine power. Through this normalization, a much simpler, single variable function (Equation 2) is derived to relate turbine pressure ratio and power to indicate turbine performance characteristics, which is easy for turbine modeling, calibration, and control method development as discussed below.
  • FIG. 3A the calibration expressed by Equation (2) based on data collected through dynamometer testing is illustrated.
  • turbine pressure ratio (y-axis) is plotted as a function of normalized turbine power (x-axis).
  • FIG. 3B turbine flow characteristics are illustrated.
  • a turbocharger manufacturer could supply data, such as the compressor isentropic efficiency map ⁇ ⁇ and the reference compressor inlet temperature and pressure are at which the turbocharger manufacturer measures compressor data.
  • the supplied data also regards corrected turbine flow as a function of both turbine pressure ratio and corrected turbocharger speed. Normalization is performed through multiplying corrected turbine flow with the turbine pressure ratio to get a normalized turbine flow, which is a polynomial function of the turbine pressure ratio, only to then remove the dependence of the turbine flow characteristics on the turbocharger speed term.
  • the target normalized turbine flow ⁇ m T T is calibratable as a function (/ 2 ) of the target turbine pressure ratio (Pr ⁇ ) as follows: p Tb0ut - W r TM ) (3) ' where jT TbIn /P Tb0ut is an exhaust flow boundary condition to normalize exhaust lows.
  • a turbine flow tern corrected flow supplied by turbocharger manufacturers is a function of multiple factors: turbine pressure ratio and corrected speed.
  • the normalized turbine flow therefore, could be expressed as a function of pressure ratio, which simplifies the relationships between turbine characteristics.
  • ⁇ ⁇ ⁇ ' is a target wastegate valve opening position from fully-closed end stop, which is used to position the wastegate valve 248.
  • Equation (2), (3), and (4) Equation (5) above to replace the target normalized turbine and wastegate flows and the target turbine pressure ratio, the following relationship (g) is obtainable: K ' '
  • Equation (6) the target wastegate valve opening position from fully- closed end stop is directly calculated based on normalized exhaust flow and target normalized turbine power.
  • Intermediate variables discussed herein target turbine pressure ratio, target turbine/wastegate valve mass flow rates, etc., which are required to be calculated by conventional model-based techniques, no longer need to be calculated. This could significantly reduce costs and time in the development phase.
  • a closed-loop target wastegate valve opening position term (or "correction term") could be utilized.
  • a proportional-integral-derivative (PID) control strategy could be utilized to add the correction term to minimize an error between target and current (actual) throttle inlet pressure.
  • the actual throttle inlet pressure is measured by inlet pressure sensor 224.
  • an adaptation scheme could also be utilized. This adaptation includes learning the target wastegate valve opening position due to boost pressure error and storing it in adaptation cells (e.g., at a memory (not shown) of the controller 140).
  • the adaptation process should be slow and enabled only in certain stable (e.g., non-transient) conditions.
  • the sum of the open-loop, closed-loop, and adaptation terms could then be sent to the wastegate actuator 252 for closed-loop position control using the sensor 256.
  • FIG. 4 a flow diagram of an example method 400 for controlling a vehicle turbocharger.
  • the method 400 is implemented and performed by the controller 140, but it will be appreciated that another suitable control device or multiple controllers/control devices could collectively implement and perform the method 400.
  • the controller 140 obtains a torque request for the engine 104.
  • the controller 140 determines a target compressor power based on the engine torque request.
  • the controller 140 determines a normalized target turbine power based on the target compressor power.
  • the controller 140 determines a target position for the wastegate valve 248 based on the normalized target turbine power and a normalized exhaust flow.
  • the controller 140 actuates the wastegate valve 248 (e.g., using actuator 252) to the target position.
  • the actuation of the wastegate valve 248 by the controller 140 (i) decreases at least one of boost reservation and throttling losses to (ii) increase at least one of engine response, performance, and fuel economy.
  • the method 400 then ends or returns to 404 for one or more additional cycles.
  • controller refers to any suitable control unit configured to perform at least a portion of the techniques of the present disclosure.
  • Examples include an ASIC, one or more processors and a non-transitory memory having instructions stored thereon that, when executed by the one or more processors, cause the controller to perform a set of operations corresponding to at least a portion of the techniques of the present disclosure.
  • the one or more processors could be either a single processor or two or more processors operating in a parallel or distributed architecture.

Abstract

L'invention concerne des techniques de commande pour un turbocompresseur d'un moteur qui utilisent une soupape de décharge configurée pour dévier un gaz d'échappement d'une turbine du turbocompresseur qui est accouplée de manière rotative à un compresseur du turbocompresseur. Un dispositif de commande est utilisé pour obtenir une demande de couple pour le moteur, déterminer une puissance de compresseur cible sur la base de la demande de couple de moteur, déterminer une puissance de turbine cible normalisée sur la base de la puissance de compresseur cible, déterminer une position cible pour la soupape de décharge sur la base de la puissance de turbine cible normalisée et d'un flux d'échappement normalisé, et actionner la soupape de décharge vers la position cible. De telles techniques de commande impliquent le calcul effectif de beaucoup moins de paramètres intermédiaires, tels que le rapport de pression de turbine cible, ce qui permet d'obtenir un étalonnage et une mise en oeuvre plus efficaces.
EP17711942.7A 2016-04-29 2017-03-06 Techniques de contrôle d'un turbochargeur de véhicule basées sur la physique Active EP3449109B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/142,578 US10066541B2 (en) 2016-04-29 2016-04-29 Physics-based vehicle turbocharger control techniques
PCT/US2017/020863 WO2017189094A1 (fr) 2016-04-29 2017-03-06 Techniques de commande de turbocompresseur de véhicule basées sur la physique

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EP3449109A1 true EP3449109A1 (fr) 2019-03-06
EP3449109B1 EP3449109B1 (fr) 2020-10-07

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US10066541B2 (en) 2018-09-04
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CN109072772A (zh) 2018-12-21
WO2017189094A1 (fr) 2017-11-02
EP3449109B1 (fr) 2020-10-07

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